<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
 {%extends "base.html"%}
<body>
    首页
    <h1>{{hello}}</h1>     
     {%block mainbody%}
     <p>继承了base.html文件</p>
     {%endblock%}
</body>
</html>